September 2016 Service and Repair ManualManifoldsPart No. 1268556 89How to Adj ust the Sec ondary Boom U p Reli ef Val veHow to Adjust the SecondaryBoom Up Relief ValveNote: Refer to Function Manifold Component list tolocate the secondary boom up relief valve.1 Remove the cover retaining fasteners from thesecondary boom end cover. Remove the coverfrom the machine.2 Locate the wire connector for secondary boomlimit switch LSS2AO. Disconnect theconnector.Note: The secondary boom limit switch LSS2AO isthe upper limit switch located on the inside of theriser plate at the engine side of the machine.3 Install a jumper wire between pins 3 and 4 ofthe LSS2AO Deutsch connector on the wireharness end.4 Connect a 0 to 5000 psi / 0 to 350 barpressure gauge to the ls port on the functionmanifold.5 Start the engine from the ground controls.6 Simultaneously push and hold the functionenable/high speed button and the secondaryboom up/extend button and fully raise thesecondary boom.7 Continue holding the function enable/highspeed button and the secondary boomup/extend button while observing the readingon the pressure gauge. Refer toSpecifications, Hydraulic Specifications.8 Turn the engine off. Use a wrench to hold therelief valve and remove the cap.9 Adjust the internal hex socket. Turn itclockwise to increase the pressure orcounterclockwise to decrease the pressure.Install the relief valve cap.Tip-over hazard. Do not adjustthe relief valve higher thanspecified.10 Repeat steps 5 through 7 to confirm reliefvalve pressure.11 Remove the pressure gauge.12 Remove the jumper wire from LSS2AO limitswitch connector. Connect the limit switch tothe wire harness.13 Install the secondary boom end cover andtighten the retaining fasteners.
